Traffic Data Collection and Analysis
Automatic Traffic Recorder (ATR) and Weigh In Motion (WIM) ReportsTraffic Data Collection & Analysis (TDCA) Section currently has a total of eighty-six permanent counters, fifty-five Automatic Traffic Recorder (ATR) sites and thirty-one Weigh In Motion (WIM) sites throughout the state of Montana collecting traffic data on a daily basis. In addition to providing volume information, a significant number of ATRs and WIMs provide information such as vehicle length, classification and truck weight data.
The primary purpose of permanent counters is to obtain information for: 1) converting/factoring/seasonally adjusting short term counts to estimate Annual Average Daily Traffic (AADT); 2) providing generalized peak and design hour factors for highway geometric design; 3) monitoring monthly and annual traffic trends and 4) providing long term growth factors. As mentioned previously, ATRs and WIMs also provide vehicle classification and weight data as well as unbiased speed data.
If you have questions or concerns, of if you are planning or currently working on a project that might potentially impact an ATR or a WIM site, please contact Becky Duke at 444-6122 or Ron Wuertley at 444-5521.
ATR and WIM location map (.pdf)
List sorted by ATR/WIM Site ID | by Departmental Route
Annual ATR and WIM Reports
The annual ATR and WIM report provides summary traffic data collected from MDT's permanent traffic counters (ATR and WIM sites). The report includes average weekday traffic and average day of week traffic by month, 10th, 20th and 30th (DHV), 50th and 100th highest hours and, where available, vehicle mix percentages (passenger vehicle and small and large truck). The report contains the historical traffic data available for each permanent count site.
2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003
2002 | 2001 | 2000 | 1999 | 1998
Monthly ATR and WIM Reports
The Monthly Comparison reports provide the change in traffic volumes, as compared to the same month last year (i.e. January 2009 as compared to January 2008), at each of MDT's permanent traffic counter locations. Comparison reports are available for Commercial (trucks) Vehicles (Types 5 - 13), Large Trucks (Types 8-13) and All Vehicles (Types 1-13).
The Monthly Calendar provides traffic volumes by day, by direction and by roadway from MDT's permanent traffic counters.
These reports provide a general overview of the monthly traffic trends at each of Montana's permanent counter locations but the trends are not necessarily representative of the statewide trend.
Data/Statistics Quick Links